2003 Yamaha yz250f troubleshooting

[Natedawgrebuilds]

Hey guys I just picked up a 2003 yz 250f and it loose compression when kick starting it. It kickstart no problem when cold around 2 Kick when playing with the kick start getting the piston to compression stroke. But when warm it doesn't wanna kick over I can move the kick start down with my hand, it isn't firm like a 250 should be. I'm mechanically incline with cars but this is my first bike. the guy I bought it off of told me he redid the valve so I'm thinking he messed the clearance up

 

[Natedawgrebuilds]

Forgot to mention bike run great when it warm I just bum start it. Kinda stuck tho I would love to have a bike kickstart anytime and anyplace no problem. I'm doing a full rebuilt on the bike this winter but I wanna ride it before it the season ends

 

[Rich Rohrich]

Checking the valve clearance is very easy on these engines and is the logical place to start given what you have described.